VBA Reference Attachment

I have a vba script that attaches reference files using the 'ActiveModelReference.Attachments.AddCoincident' function.

I need to modify it to work within the Projectwise environment but I am getting 'File not found' errors.

The filename string is:-

"pw:\\VM110:Development (Login Server)\Documents\Common Data\Mapping\filename.dgn"
If I use the same string in the keyin window using 'rf=', the file will attach.

 Is there a different syntax to be used when working with Projectwise from vba?